You are welcome--lets correct some stuff though! I found the death certificate's for Kozzie's parents on familysearch.org
John Morgan Box,born Jan.28,1871-LA;died June 18,1936 "near Maypearl",Ellis Co.,TX;surviving spouse,Nancy Box. Father given as Wise Box,born in AL,and mother Martha Bolton,also born AL John Box was buried in Bethel Cemetery,Maypearl,Ellis,TX
Nancy Box,born Apr.15,1871-LA;died Feb.12,1946,"Bee Creek Community",Milford,Ellis,TX;widowed Father given as Jim Cockerham-born TN;and mother Lizzie Rudd-born LA. Nancy Box was also buried in Bethel Cemetery,Maypearl,TX
If you will go here: http://raogk.com/search.htmlhttp://raogk.com/search.html and search for volunteers in Ellis Co.,TX; there is one who is willing to photograph in all cemeteries in the county and do other research;click on her name to send a request.
I found Quince Box's obit posted at findagrave.com It lists his surviving siblings (in 1968) as: Jim Box of Calvin;Allen Box of Dodson;Morgan Box of Waxahachie,TX; Mrs. Mattie Cockerham of Milford,TX, and Mrs. Kossie Cockerham of Joyce.
So, based on that, I found a death certificate for "Mattie Elizabeth Cockerham",also on familysearch.org; Born Mar.9,1901-LA;died Dec.26,1971 in Hillsboro,TX;father John Box and mother Nancy Cockerham. She is also buried in Bethel Cemetery,Maypearl,TX.
Looks to me like a whole bunch of this family is in the 1930 census in Ellis county, TX. In retrospect, where I gave you the name of "Marion" as a brother to Kozzie, I looked at it again,and I think it's "Morgan"--old handwriting can be hard!